Why 44% of Small Employers Are Now Self-Funding — And What That Means for Your Quote Volume

By Arunava Acharjee |  Stop Loss

Something structurally significant has happened in the small group health insurance market, and it has happened faster than most stop-loss carriers modelled.

As of 2025, 44% of covered workers at firms with 10 to 49 employees were enrolled in a self-funded or level-funded plan. Five years ago, that number was closer to 25%. The migration is accelerating, driven by premium inflation in the fully insured small group market that has made self-funding economically attractive for groups that previously considered it too risky.

For stop-loss carriers and MGUs, this is not background context. It is a direct driver of submission volume — and it is reshaping who is submitting, what they’re submitting, and how much actuarial complexity the underwriting team needs to handle.

Why Small Employers Are Making the Move

The proximate cause is premium inflation. The median proposed rate increase for ACA-compliant small group plans in 2026 is 11% — with 10% of insurers requesting increases above 20%. For a 40-life employer currently paying $7,000 per employee annually, an 11% increase means an additional $30,800 in annual costs. A 20% increase means $56,000.

At that level of increase, the self-funded economics become compelling even for groups that were previously cautious. Level-funded plans offer the cost control of self-funding with the premium predictability of a fully insured arrangement — and the availability of these products has increased significantly as carriers have expanded their level-funded offerings to capture this migrating segment.

The secondary driver is the ACA risk pool deterioration. As KFF data shows, the fully insured small group market is experiencing adverse selection as healthier groups exit to self-funded alternatives, leaving a higher-acuity remaining pool. That acuity effect pushes rates higher, which drives more healthy groups to self-fund, which pushes rates higher again. It is a structural dynamic, not a cyclical one.

What This Means for Stop-Loss Underwriting Volume

Every employer group migrating from fully insured to self-funded or level-funded needs stop-loss coverage. The specific and aggregate protection that a fully insured carrier previously provided internally now needs to be sourced from the stop-loss market.

This creates a straightforward volume implication: if 44% of small employers in the 10–49 employee range are now self-funded, and that number was 25% five years ago, the addressable stop-loss market in that segment has expanded by roughly 75% in five years. Not 5% or 10% — structural expansion of the market.

For carriers with the infrastructure to process this volume, it is a growth opportunity. For carriers whose underwriting throughput is constrained by manual processes, it is a capacity problem. The groups that the market previously didn’t need to underwrite — the 10 to 30 life employer that was reliably in a fully insured product — are now entering the stop-loss submission queue.

The Complexity Dimension

Small employer groups in the 10 to 49 life range are not simpler to underwrite than mid-market groups. In some respects they are harder. Prior year claims data is often limited or absent. Census files are frequently incomplete or poorly formatted. Industry classification is sometimes ambiguous for small businesses operating across multiple SIC categories.

At the same time, the economics of underwriting these groups are different from mid-market. A 15-life submission has a lower premium ceiling than a 200-life group. If it requires the same underwriter time to process, the unit economics are unfavourable. Carriers who are scaling in the small group stop-loss space are doing so through automation that reduces per-submission processing cost — not through hiring.

The Level-Funded Nuance

Level-funded plans introduce a stop-loss design variation worth understanding. The employer pays a fixed monthly amount — covering expected claims, administration, and stop-loss premium — with a year-end settlement if actual claims come in below projection. The stop-loss component is typically a specific policy at a relatively low attachment point (often $15,000 to $40,000) plus aggregate protection.

This structure is attractive to small employers precisely because it caps their maximum exposure. For stop-loss underwriters, it means writing specific business at lower attachment points than traditional self-funded accounts — with smaller groups and thinner prior year data. The actuarial challenge is pricing that aggregate layer accurately when the group’s claims history is short.

Carriers who are building systematic rating approaches for level-funded small groups — using industry benchmarks and predictive models where prior experience is limited — are better positioned in this growing segment than those applying large-group rating methodology to 15-life submissions.

The Infrastructure Implication

The practical challenge for stop-loss operations teams is scaling submission processing for a market segment that is growing fast and is inherently high-volume. A carrier processing 200 mid-market submissions per month may now be receiving an additional 150 small group submissions as the level-funded market expands. Handling that incremental volume with manual processes requires proportional headcount increases that erode the margin improvement.

The carriers who will capture the small group stop-loss opportunity most profitably are those who can process high volumes of smaller submissions at low per-unit cost — through automated census extraction, standardised rating rules, and rapid proposal generation. The same infrastructure that enables 36-hour turnaround on mid-market business enables scalable processing of small group volume.

DataHub’s platform was built to handle variable submission volume without proportional headcount scaling. SmartExtractor™ processes small group census files as efficiently as mid-market submissions
— regardless of format quality. Contact us to discuss how DataHub scales with your book.